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Title: Suppression of erosion in the DIII-D divertor with detached plasmas

Abstract

The ability to withstand disruptions makes carbon-based materials attractive for use as plasma-facing components in divertors. However, such materials suffer high erosion rates during attached plasma operation which, in high power long pulse machines, would give short component lifetimes and high tritium inventories. The authors present results from recent experiments in DIII-D, in which the Divertor Materials Evaluation System (DiMES) was used to examine erosion and deposition during short exposures to well defined plasma conditions. These studies show that during operation with detached plasmas, produced by gas injection, net erosion is suppressed everywhere in the divertor. Net deposition of carbon with deuterium was observed at the inner and outer strikepoints and in the private-flux region between strikepoints. For these low temperature plasmas (T{sub e} < 2eV), physical sputtering is eliminated. These results show that with detached plasmas, the location of carbon net erosion and the carbon impurity source, probably lies outside the divertor. Physical or chemical sputtering by charge-exchange neutrals or ions in the main plasma chamber is a probable source of carbon under these plasma conditions.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
756167
Report Number(s):
SAND2000-1327C
TRN: US0003848
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 14th International Conference on Plasma Surface Interactions in Controlled Fusion Devices, Rosenheim (DE), 05/22/2000--05/27/2000; Other Information: PBD: 25 May 2000
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DOUBLET-3 DEVICE; PLASMA DISRUPTION; DIVERTORS; THERMONUCLEAR REACTOR MATERIALS; EROSION; DEPOSITION; PLASMA IMPURITIES

Citation Formats

WAMPLER,WILLIAM R., BASTASZ,ROBERT J., WHYTE,D.G., WONG,C.P.C., and WEST,W.P. Suppression of erosion in the DIII-D divertor with detached plasmas. United States: N. p., 2000. Web.
WAMPLER,WILLIAM R., BASTASZ,ROBERT J., WHYTE,D.G., WONG,C.P.C., & WEST,W.P. Suppression of erosion in the DIII-D divertor with detached plasmas. United States.
WAMPLER,WILLIAM R., BASTASZ,ROBERT J., WHYTE,D.G., WONG,C.P.C., and WEST,W.P. Thu . "Suppression of erosion in the DIII-D divertor with detached plasmas". United States. https://www.osti.gov/servlets/purl/756167.
@article{osti_756167,
title = {Suppression of erosion in the DIII-D divertor with detached plasmas},
author = {WAMPLER,WILLIAM R. and BASTASZ,ROBERT J. and WHYTE,D.G. and WONG,C.P.C. and WEST,W.P.},
abstractNote = {The ability to withstand disruptions makes carbon-based materials attractive for use as plasma-facing components in divertors. However, such materials suffer high erosion rates during attached plasma operation which, in high power long pulse machines, would give short component lifetimes and high tritium inventories. The authors present results from recent experiments in DIII-D, in which the Divertor Materials Evaluation System (DiMES) was used to examine erosion and deposition during short exposures to well defined plasma conditions. These studies show that during operation with detached plasmas, produced by gas injection, net erosion is suppressed everywhere in the divertor. Net deposition of carbon with deuterium was observed at the inner and outer strikepoints and in the private-flux region between strikepoints. For these low temperature plasmas (T{sub e} < 2eV), physical sputtering is eliminated. These results show that with detached plasmas, the location of carbon net erosion and the carbon impurity source, probably lies outside the divertor. Physical or chemical sputtering by charge-exchange neutrals or ions in the main plasma chamber is a probable source of carbon under these plasma conditions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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